Adaptive signal enhancement based on improved VMD-SVD for leak location in water-supply pipeline

A method of rain uniformity’s distribution was presented for different spraying devices, which were set on irrigation machines working in different mode of moving. A method for effective irrigation radius and width calculation was justified by using irrigation depth uniformity values from the area under water supply pipeline of the irrigation machine.

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Measurement of indoor environmental parameters and analysis of the condensation phenomenon in urban utility tunnels

Indoor and Built Environment ◽

10.1177/1420326x211056485 ◽

2022 ◽

pp. 1420326X2110564

Author(s):

Chuanmin Tai ◽

Guansan Tian ◽

Wenjun Lei

Keyword(s):

Water Supply ◽

Surface Temperature ◽

Air Temperature ◽

Natural Ventilation ◽

Environmental Parameters ◽

Dew Point ◽

Control Mode ◽

Safe Management ◽

Environmental Test ◽

Water Supply Pipeline

Condensation is a major issue in the safe operation of utility tunnels. To address the condensation problem, the indoor air temperature, relative humidity (RH) and surface temperature in an urban utility tunnel in Jining were continuously measured, and the condensation conditions were surveyed and analysed. The results indicated that under natural ventilation conditions, the air temperature in the comprehensive cabin varied from 23.4°C to 24.5°C, the RH fluctuated between 86.4% and 95.3%, and the corresponding air dew point temperature (DPT) remained in the range of 22.2°C–22.9°C. The surface temperature of the water supply pipeline ranged from 17.8°C to 18.5°C, which was far lower than the DPT in the tunnel, resulting in serious condensation. A water supply pipeline with an anti-condensation design was developed based on environmental test data. A 25-mm-thick rubber plastic sponge insulation layer was used to thermally insulate the water supply pipeline, preventing further dew condensation. Furthermore, mechanical ventilation had little effect on reducing the RH in the tunnel and may actually cause dew condensation; therefore, a ventilation control mode was proposed in this study. These results are expected to provide basic data for further research and reference for the safe management of utility tunnels.

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Seismic Damage Assessment of Urban Water Supply Pipeline

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.316-317.723 ◽

2013 ◽

Vol 316-317 ◽

pp. 723-726

Author(s):

Jian Qun Jiang ◽

Xiao Wen Yao ◽

Yi Ting Lu

Keyword(s):

Water Supply ◽

Damage Assessment ◽

Longitudinal Direction ◽

Underground Water ◽

Seismic Damage ◽

Pipeline System ◽

Seismic Damage Assessment ◽

Water Pipeline ◽

Ground Condition ◽

Water Supply Pipeline

Water supply pipeline system is a key issue in urban lifeline engineering, and the seismic assessment for the system damage is of significant importance. In this study, method of seismic damage assessment on underground water supply pipeline is introduced. With emphasis on the uncertainties of earthquake level, ground condition, soil-pipe interaction and capacity to resist pipe deformation in longitudinal direction, the check point method is applied to the reliability study of water pipeline, and a case study is presented to show the implementation of the proposed model.

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Extraction of gastric slow waves from electrogastrograms: Combining independent component analysis and adaptive signal enhancement

Medical & Biological Engineering & Computing ◽

10.1007/bf02345962 ◽

2005 ◽

Vol 43 (2) ◽

pp. 245-251 ◽

Cited By ~ 19

Author(s):

H. Liang

Keyword(s):

Independent Component Analysis ◽

Component Analysis ◽

Signal Enhancement ◽

Independent Component ◽

Slow Waves ◽

Gastric Slow Waves ◽

Adaptive Signal

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Analysis of Propagation and Distribution Characteristics of Leakage Acoustic Waves in Water Supply Pipelines

Sensors ◽

10.3390/s21165450 ◽

2021 ◽

Vol 21 (16) ◽

pp. 5450

Author(s):

Yunfei Li ◽

Yang Zhou ◽

Ming Fu ◽

Fan Zhou ◽

Zhaozhao Chi ◽

...

Keyword(s):

Acoustic Wave ◽

Water Supply ◽

Acoustic Waves ◽

Simulation Analysis ◽

Acoustic Signals ◽

Detection Methods ◽

Acoustic Analogy ◽

Acoustic Wave Propagation ◽

Source Characteristics ◽

Water Supply Pipeline

Leakage detection methods based on the analysis of leakage acoustic signals provide an effective technical approach for detecting small leaks in water supply pipelines. From a technical perspective, the study of the propagation characteristics of acoustic waves generated by the leakage in the water supply pipeline is necessary for detecting the leak location on the basis of acoustic signals. In this study, a 3D transient leakage acoustic wave propagation equation was derived by combining the principles of fluid dynamics and Lighthill acoustic analogy theory. The propagation of the leakage-induced noise in water supply pipeline was modelled theoretically. We simulated the propagation of a leakage acoustic wave under different conditions for different target scenarios encountered in actual pipeline inspections. Specifically, we analysed the effect of different factors, such as the pipe size and acoustic source characteristics, on acoustic propagation. Finally, the simulated experiments were practically performed using a self-designed simulated water supply pipeline and self-developed spherical water supply pipeline detector to validate the simulation analysis. The results of this study provide a theoretical guidance and basis for the analysis of characteristics of leakage acoustic wave signals and the recognition of leakage conditions in water supply pipelines.

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Artifact Elimination in Impedance Cardiography using Gradient based Adaptive Signal Enhancement Techniques

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.b1632.078219 ◽

2019 ◽

Vol 8 (2) ◽

pp. 598-606

Keyword(s):

Stroke Volume ◽

Blood Volume ◽

Impedance Cardiography ◽

Signal Enhancement ◽

The Body ◽

Body Segment ◽

Volume Changes ◽

The Real ◽

Adaptive Techniques ◽

Adaptive Signal

Impedance Cardiography (ICG) is a noninvasive method for indirect measurement of stroke volume, monitoring the cardiac output and observing the other hemodynamic parameters by the blood volume changes in the body. The blood volume changes inside a certain body segment due to a number of physiological processes are extracted in the form of the impedance variations of the body segment. The ICG analysis provides the heart stroke volume in sudden cardiac arrest. In the clinical environment desired ICG signals are influenced by several physiological and non-physiological artifacts.As these artifacts are not stationary in nature, we proposed adaptive filtering techniques to eliminate the artifacts. In this paper we used Least Mean Square (LMS), Least Mean Fourth (LMF), Median LMS (MLMS), Leaky LMS (LLMS), and Dead Zone (DZLMS) adaptive techniques to eliminate artifacts from the desired signals. Several adaptive signal enhancement units (ASEUs) are developed based on these adaptive techniques, and evaluated on the real ICG signal components. The ability of these algorithms is evaluated by performing the experiments to eliminate the various artifacts such as sinusoidal artifacts (SA), respiration artifacts (RA), muscle artifacts (MA) and electrode artifacts (EA). Among these techniques, the DZLMS based ASEU performs better in the filtering process. The signal to noise ratio improvement (SNRI) for this algorithm is calculated as 11.9140 dB, 7.3657 dB, 10.4060 dB and 10.5125 dB respectively for SA, RA, MA and EA. Hence, the DZLMS based ASEUs are well suitable for ICG filtering in the real time health care monitoring systems.

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